Dressing tool holder



April 3, 1945. NORRls ET AL 2,372,732

DRES S ING TOOL HOLDER Filed .July 17 1943 INVENTORS Dalq E. Norr/J C. Will/0rd Greanmg ATTORNEYS.

Patented Apr. 3, 1945 Hillsda'le; Michz, assignors'to Allied Products (Born-oration; Detroit, Mich.-, a corporation of- Application Jnly 1-7, 1943, Serial .No. 495,114

I!) Glztimsz This inventionrelates to a wheehdressing tool.

holder.

It is the object, ofv the invention to prov-ideal relatively simple, but effective, tool holder for. dressinga grinding wheelorother wheel with a tool. that turns; sequentially on morerthan onev radius.

It is; sometimes desirable; to provide. a. groove-on za-pgrinding Wheel or'other wheel formed in cross' section on arcs which have different radii.

, Itisithe :obj ect of the; present-invention to. pro-- vide for this purpose ;-asimple tool holder that maYbewsecm'ed in a 'standard rinding wheel profiling attachment.

In the drawing? Fig; l. is i a fragmentary elevational view.- par.t-,

ly in section showingi-as grinding; wheel and-a profiling attachment: with. our improved tool holder in place.

Fig. 2 is. an end elevation of our improved tool holder. Fig. 3 is a cross-sectionofithersameshowing; the removable operating crank. in 'place.

in-place. This shank carries a body into which one or more rotating tool holdersmayJbe-s'upported. drawing. A rotating shaft 1 is supported in'a rotatable. bushing. 8.- The bus'hinghasan' enlargedv head?! and-a coiled expansion-spring Ill bearing against the pin. I I. whichis driven-into shaft 1 puts a; loadon=both washers IlandII BI and thereby establishing frictional resistance-to the turning of either the bushingporithelshaft 7. This tends to keep boththe-shaft andzthe bushing in any position to; which either is turned.

Referring, to. Figs. 4a; 5a; ,and 16a, it-will be seen that a diamond-'10 iSmmriedlin theanib or dop; I 6; Fig. 4a shows vthelp'ositionof the-diamond with respect to the periphery-tithe :grinding wheel i; It will be noted that the. bottom-rot the; groove" on the right hand side is .formedronian 'arc whose center is at" I 1 .In' Fig; .5a the'. 'to'ol z'is-ishown'nn the very bottomtof the lg ro'ove but stillthesnib turns onthe. center H, .butcatithisxpoint the tool Fig..4 is -a perspective-showing the t'oo'lholder andthegoperating crankinthe initial position.

Fig: 4a is. a: companion diagrammatic view showing-the .tool in' the. position with respectto the work which-ittakeswhenthe tool-holder parts are'in the-position shown in Fig. 4.

Fig. 5 isca' perspective showingthetool holder after the cranlehasturneathe inner supporting, shaft through 90.

Figs 5a is a: companion: diagrammatic view showing the position: of the: tool with respect to thework'.

Fig.- o' is a perspectiveview showing the tool holder-and crank atter the crankhas been turned through 180".

Fig. fia shows the-tooi withirespect to the work when the parts'a-re as shownzin'Figrfi.

Fig. 7 is-adetailed perspective showing the operating cranhpressedxin to returntthe rotary parts of the holder to their'initial. position.

Thegrinding wheel isdesignated I. 2.:is the casing-enclosing the grinding wheel. 3 designates a grindingwheel profiling attachment which is=roi standard construction and available on .the .market. This is provided with ahead orchuck-which ordinarily carries a nib or stop into -the: end of i is soldered-or otherwise. fastened: a diamon'd for dressing-= the -periphery of the. grinding. wheel in the-usual way;

We-have designed a dressing tool holder which has a shank 5Ithat"may=be secured the :chuck or sleeve-"in the usual manner that a .nibtisisecured is about to shift: the center" on which it turns:

InFigH'Ba it is shownturningcn thercenter to which affords a larger radius;

In Fig. 4 the two rotating tool supporte -(thebush-ing :8 and thelshatt 1 3 arelshovl'n in the position they assume with the. tool inzthe-ziposition show-nimFig. to; A cranlealfl is provided with a" sleeve or sachet -20 whi'ch has t'wmslotsi! 'nd 22. Note'that in Fig; 4 s1otf 22 -embraces:pinzfl on the underside of shaft 1; This-is preparatory to the initial turriingof thesdiamonds- InEig:

5' the crankl9 has turned through 9'0 and so has shaft =1 by 'rea'son of the keying of the shaf-t' to the socket-of the crank-by means of 'slotr zman'd pin 231- At this point pin' 2l is the-shaft isabout to Dick un-stud 25in theheadi'w 0f'the-=b11Sh ing: When this-pick -up is efiectedthe-shaft and' the bushing turrr together."

shifts from center 'I 1 to cen'ter 8; which-is the center on' which thetoshing turns The shaft is eccentrically supported-in the bushing.

Referring to'Fig; 6; it willhe seentha-t thecrank is now turned through 180. The-bushing is turned through andthekey lug 28 has turned from a horizontal position ilIFi'gsi hand to a vertical posi'tion; Pin" 21' in'thetperiphery of' the bushingh'ead has now encounteredstudflfl in the bbdyof the toOlhbldr andstcppeclforther counterclockwise turning. ,of the two rotaryto'ol supports.. The diamond (Fig; '6) has been turned to. the-positionwhere it has .fi'nished 'the work onwtheleftlhand .sideof thegroove and has We have shown only. one here int'he Consequently, the radius-on which the' nib -or' diamond dop turns:

ished turning through an arc of 90 on the larger radius whose center is at it.

To return the tool, the crank is now pushed in further, as shown in Fig. '7, and the slot 22 now straddles the key lug 26 as well as pin 23. The crank may now be turned clockwise and both the shaft and the bushing will turn 90 therewith. At the end of 90 pin 21 encounters stud 29 protruding from the body of the tool holder. This arrests further turning of the crank until the in-' ward pressure on the crank :handle is released and spring 30 causes the crank to shift outwardly causing slot 22 to clear the key lug 26. The turning of the crank in a clockwise direction may now be resumed and continued through 90 which will bring the nib it back to the position shown in Fig.4a.

It will be evident that the dressing tool may be swung back and forth oscillating the crank through 180. The tool holder will automatically shift from turning on one radius to turning on the larger radius, as the diamond reaches the bottom of the groove in the counter-clockwise swing of the crank. Then the tool is pressed in and as the crank swings in a clockwise direction the turning will be arrested at the bottom of the groove. Ihe pressure can then be released on the crank and the tool will shift to turn on the smaller radius.

What we claim is:

1. In a tool holder for the purpose described, the combination of a body, two rotatable tool supports supported to turn therein, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said two rotatable tool supports having interengageable members and arranged first for independent rotation of the inner support and then to be automatically coupled by the interengagement of said members for continued rotation of thetwo supports together in the same direction, thereby causing the tool to rotate first on one radius and then on another radius as the tool supports are turned in one and the same direction.

2. In a tool holder for the purpose described, the combination of a body, two rotatable tool supports supported to turn therein, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said two rotatable .tool supports having interengageable members and arranged first for the rotation of the inner tool support independently and then the inner tool support automatically picking up the outer rotating tool support by interengagement of said members to cause the two tool supports to rotate together in the same direction on the larger radius, a stop and hand actuated means for rotating the inner tool support and manipulatable to tie the two supports together for part of the return inactive movement of the tool until the stop is reached and then release the outer support for the rest of the return inactive movement of the tool in the same direction.

3. In a tool holder for the pu p e described, the combination of a body, two rotatable tool supports supported to turn therein, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said two rotatable tool supports arranged first for the rotation of the inner tool support independently and then the inner tool support picking up the outer rotating tool support to cause the two tool supports to rotate to- Lil gether on the larger radius, the said inner rotating tool support being provided with a pin and the outer rotating tool support being provided with a stud arranged to be picked up by the pin after a given independent rotation of the inner tool support.

4. In a tool holder for the purpose described, the combination of a body, two rotatable tool supports supported to turn therein, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said two rotatable tool supports arranged first for the rotation of the inner tool support independently and then the inner tool support picking up the outer rotatingtool support to cause the two tool supports to rotate together on the larger radius, the said inner rotating tool support being provided with a pin and the outer rotating tool support being provided with a stud arranged to be picked up by the pin after a given independent rotation of the inner tool support, and means for stopping the coupled rotation of the two'supports after a given angular movement of the same.

5. In a tool holder for the purpose described, the combination of a body, two rotatable tool supports supported to turn therein, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said two rotatable tool supports arranged first for the rotation of the inner tool support independently and then the inner tool support picking up the outer rotating tool support to cause the two tool supports to rotate together on the larger radius, the said inner rotating tool support being provided with a pin and the outer rotating tool support being provided with a stud arranged to be picked up by the pin after a given independent rotation of the inner tool support, and means for placing a load upon the two rotatable members'to provide frictional resistance to their turning.

6. In a tool holder forv the purpose described, the combination of a body, two rotatable supports supported to turn therein, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said two rotatable tool supports arranged first for rotation of the inner tool support independently and then the inner tool support picking up the outer rotating tool support to cause the tw tool supports to rotate together on the larger radius, the said inner rotating tool support being provided with a pin and the outer rotatin tool support being provided with a stud arranged to be picked up by the pin after a given independent rotation of the inner tool support, and means for placing a load upon the two rotatable members to provide frictional resistance to their turning comprising a spring throwing a load on a pair of washers, one washer of which bears against a part of the inner rotary member and the other washer of which bears against the said body,

7. In a tool holder for the purpose described, the combination of a body, two rotatable supports supported to turn therein, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said two rotatable tool supports arranged first for the rotation of the inner tool support independently and then the inner tool support picking up the outer rotating tool support to cause the two tool supports to rotate together on the larger radius, the said inner rotating tool support being provided with a pin and the outer rotating tool support being provided with a stud arranged to be picked up by the pin after a given independwhereupon the crank socket may be pushed in further to key the crank to the outer rotary memher by the slot straddling the key lug to couple the two together for return rotation.

8. In a tool holder for the purpose described,

the combination of two rotatable tool supports, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry .the tool, the said supports arranged first for the rotation of the inner support independently and then the inner support picking up the outer rotating support to cause the two supports to rotate together on the larger radius,

the said inner rotating support being provided with a pin and the outer rotating support being provided with a stud arranged to be picked up by the pin after a given independent rotation of the inner support, the said inner rotary support provided with an exposed portion carrying a projecting key pin and the said outer rotary support carrying a key lug whereby a crank with a slotted socket may be engaged over the projecting portion of the inner rotary support and turn the inner rotary support through its independent movement and also through its coupled movement with the outer rotary support in one direction of the turning, then the crank socket may-be pushed further in on the exposed portion to straddle the key lug to return both rotary supports, and means for stopping the outer'support upon a pro-determined angular return movement permitting partially withdrawing the crank socket and continuing the return movement of the inner rotary support. l

9. In a tool holder for the purpose described, the combination of two rotatable tool supports, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said supports arranged first for the rotation of the inner support independently and then the inner support picking up the outer rotating support to cause'the two supports to rotate together on the larger radius, the said inner rotating support being provided with a pin and -the outer rotating support being provided with a stud arranged to be picked up by the pin after a given independent rotation of the inner support, the said inner rotary support provided with an exposed portion carrying a projecting key pin and the said outer rotary support carrying a key lug, a crank with a spring therein and a slotted socket which may be engaged over the projecting portion of the inner rotary support and turn the inner rotary support through its independent movement and also through its coupled movement with the outer rotary support in one direction of the turning, then the crank socket may be pushed further in on the exposed portion to straddle the key lug to return both rotary supports, and means for stopping the outer support upon a pre-determined angular return movement permitting the spring in the crank socket partially withdrawing the crank socket and continuing the independent return movement of the inner rotary support.

10. In a tool holder for the purpose described, the combination of a body, two rotatable tool supports supported to turn therein, one contained within the other, and rotatable on eccentric axes, the inner rotatable tool support arranged to carry the tool, the said two rotatable tool supports having interengageable members and arranged first for the rotation of the inner tool support independently and then the inner tool support automatically picking up the outer rotating tool support by interengagement of said members to cause the two tool supports to rotate together in the same direction on the larger radius, a stop and hand actuated means for rotating the inner tool support and manipulatable to tie the two tool supports together for part of the return movement of the tool until the stop is reached and then release the outer support for the rest of the return movement of the tool, the said means comprising a crank pressed in to tie the two supports together and released from said pressed-in position when the stop is reached to release the outer support for the remainder of the return movement.

DALE R. NORRIS. C. MILLARD GREENING. 

